{"id":"CVE-2026-118741","kind":"vulnerability","aliases":["CVE-2026-118741"],"related":[],"title":"ASP.NET Core: improper authentication lets an outside attacker gain higher privileges","description":"Improper authentication in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.","summary":"ASP.NET Core has an authentication flaw that lets an unauthorized attacker elevate privileges over the network. The sources give no further detail on the affected code path or versions.","severity":"high","cvss":8.1,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["aspnet-core","dotnet","runtime","web-apps"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:19:50+00:00","first_seen_at":"2026-11-10T19:24:55+00:00","triaged_at":"2026-11-10T19:34:46+00:00","updated_at":"2026-11-10T19:34:46+00:00","category":"runtime","confidence":0.5,"triage":{"at":"2026-11-10T19:34:46Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"ASP.NET Core: improper authentication lets an outside attacker gain higher privileges","impact":"high","summary":"ASP.NET Core has an authentication flaw that lets an unauthorized attacker elevate privileges over the network. The sources give no further detail on the affected code path or versions.","audience":"businesses","category":"runtime","nicknames":[],"who_cares":["aspnet-core","dotnet","web-apps"],"confidence":0.5,"fix_status":"unknown","needs_auth":"no","worst_case":"Unauthenticated attacker gains elevated privileges on the application","analyst_note":"Check the NVD entry and Microsoft's ASP.NET Core security advisory for affected and fixed versions, and the specific authentication weakness.","how_to_check":"- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"ASP.NET Core applications exposed to the network are the likely target, but the sources do not name the affected versions or the specific authentication path. unknown","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000652,"input_tokens":4488,"output_tokens":406,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check the NVD entry and Microsoft's ASP.NET Core security advisory for affected and fixed versions, and the specific authentication weakness.","search":"'-118741':14A,17A '-2026':13A,16A 'affect':50B 'allow':60C 'app':25B 'asp.net':1A,26B,58C 'aspnet':19B 'aspnet-cor':18B 'attack':8A,36B,63C 'authent':4A,30B,56C 'code':51B 'core':2A,20B,27B,59C 'cve':12A,15A 'detail':47B 'dotnet':21B 'elev':37B,65C 'flaw':31B 'gain':9A 'give':44B 'higher':10A 'improp':3A,55C 'let':5A,33B 'network':41B,69C 'outsid':7A 'path':52B 'privileg':11A,38B,66C 'runtim':22B 'sourc':43B 'unauthor':35B,62C 'version':54B 'web':24B 'web-app':23B","nicknames":[],"mitigations":[],"who_affected":"ASP.NET Core applications exposed to the network are the likely target, but the sources do not name the affected versions or the specific authentication path. unknown","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["aspnetcore","dotnet","high","runtime","webapps"],"campaign_type":null,"search_a":"'-118741':14A,17A '-2026':13A,16A 'asp.net':1A 'attack':8A 'authent':4A 'core':2A 'cve':12A,15A 'gain':9A 'higher':10A 'improp':3A 'let':5A 'outsid':7A 'privileg':11A","search_b":"'affect':50B 'app':25B 'asp.net':26B 'aspnet':19B 'aspnet-cor':18B 'attack':36B 'authent':30B 'code':51B 'core':20B,27B 'detail':47B 'dotnet':21B 'elev':37B 'flaw':31B 'give':44B 'let':33B 'network':41B 'path':52B 'privileg':38B 'runtim':22B 'sourc':43B 'unauthor':35B 'version':54B 'web':24B 'web-app':23B","search_c":"'allow':60C 'asp.net':58C 'attack':63C 'authent':56C 'core':59C 'elev':65C 'improp':55C 'network':69C 'privileg':66C 'unauthor':62C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:19:50+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-118741","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118741","severity":null,"published_at":"2026-11-10T19:19:50+00:00","modified_at":"2026-11-10T19:19:51+00:00","first_seen_at":"2026-11-10T19:24:55+00:00","fetched_at":"2026-11-10T19:24:55+00:00","note":null}],"documents":[],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}